Endless chain saw.



PATENTED JULY 21, 1908.

S. J. BENS. l ENDLESS CHAIN SAW. APPLIOATION HLBDTBB. 23, 190e.

(figli/1mm. /I/IIJI/l/ IN VEN T 0R.

1 .UNITED STATES' PATENT OFFICE,

SAMUEL J. BEN S, OF SAN FItANCISCOfCALIFORNIA, ASSIGNORTO WEST COAST MACHINERY COMBANY, OF SAN FRANCISCO, CALIFORNIA, ACORPORATION OF CALIFORNIA.

ENDLEss oHArN saw.

Patented July 21, 190s.

Apiiueation med February 2s, isos. serial No. 302,537.

To all whom-'it may concern:

zen of the United States, residing at SanA Francisco, in the county of San Francisco and State of California, have invented certain new and useful Improvements in Endless Chain Saws, of which they following is a speciii'cation.

In Letters Patent granted J anuarv' 17 1905 and numbered 780,476 I described a saw com rising a chain of links carrying saw teeth and running in a guide frame. If suclr guide frames are of considerable length 'as in practical use they ought to be, I have found that they are liable to lack the stiffness re uisite for doing effective work, especially w en that work is of a heavy character as for instance with the huge redwood timber of the Pacific coast.

While the general objects of the present invention are substantially the same as those set forth in the Letters Patent referred to, I have devised and herein describe and show various and useful improvements upon that construction, tendlng to increase its efficiency and usefulness. Thus I have provided meansv for reinforcing and consequently stiffening the guide frame, and also a better arrangement and construction of saw teeth, I provide alternately arranged cutting teeth and dragging teeth, the latter operating to keep the saw-kerf clear. I have also devised a better means for holding the cutting blades in theframe while at the same timeJ such blades are easily removable and replaceable in cases when renewal or re-sharpening or any kind of repair work is required.

My invention is embodied in the accom anying drawings in connection with which t is specification should be read.

Figure 1 is a side elevation: Fig. 2 is an enlarged side elevation artly in section to better illustrate the re ations of the cutting blades and dragging blades; Fig. 3 is a cross section on Vthe line 3-3 of Fig. 2 g Fig. 4 is a plan or edge view of the chain of blades; Fig.

5 is a perspective view of one of the cutting blades.

The saw frame 1 is a sheet of steel referably tapering in side elevation and aving bolted to its ends the brackets 2 and 3 in which are journaled the uide wheels 4 and`5. These Wheels have dee y toothed peripheries as shown in dotted ines in Fig. 1, sothat they are sprocket wheels upon and around which the endless chain saw is carried with ample clearance. mounted in an adjustable bearing having a. screw 6 for the purpose of regulatin thetension. The supporting bracket of t 's Wheel also has 'the handle 7 by which the operator controls the saw.

The wheel 5 is preferably. 4.

eoy

hIn my patent referred to I described and showed some features which have been omitted fromthe present description and drawings. Thus it has been considered unnecessary to describe and show different adaptations of the saw to horizontal and vertical work, or any means for driving such being shown in tha-patent referred to. The sheet or frame 1 is reinforced and stiffened preferframe 1 and the strip 8, forms a guide groove for the chain of teeth. As 'shown in Fig. 1

4these reinforcing strips are provided at both teeth of this chain are formed as links fleXibly joined to ether by rivets 14. The teeth are alternate y cutting teeth. 16 and dragging or clearing teeth 15. The drag teeth are shaped as shown in Fig. 5 and are rolled with the groove 17, so that the rolled bead 18formed on the reinforcing strip 8 can enter said groove whereby the drag teeth are vuided in their movements. toot is also provided with the downward projection 19 which extends into the guide groove, and also actsas a sprocket tooth in the recesses of the carrying wheels. The cutting teeth are preferably formed in pairs as shown with the res ective members of each pair bent outward y and o positely.

By reference to Fig. 4 it will se seen that the manner of bending the associated links which form the cutting blades and the drag blades y.form a ver thin iieXible chain in which the cutting lades are always in the middle longitudinal axis.

Each drag chain in the guide frame, comprising a bead v von the reinforcing strip and a groove in the Y 4extension of each drag tooth, 1t may under some conditions not be necessary to use such a lock, as for instance in sawing in a vertical plane; and it should also be said that the grooved extensions 19 can be formed with the cutting teeth 16, instead of with the drpag teeth 15. Indeed all the teeth might be provided With such grooved extensions or proat plate and reinforcin .,.stripsat one-side and in part spaced there om to provide a 'de groove or channel, a second reinforcing strip bent to it the first strip and plate, rivets securing said strips to the plate and to eachv other, and other rivets independently securinguthe second named strip to the plate. 2A. an endless chain saw, a plane flat sawy frame,vin combination with a double reinforcement or stiffening com rising strips at one side of said frame and a jacent to its edges but separated from saidedges sc as toV form guide grooves, a second 'reinforcing strip bentV to fit said/first strip and said sessev frame, rivets' securing 'both strips to the frame and to each other, and another set of rivets inde endntly securing said second strip to sai frame.

3. In an endless chain saw, the combinal tion with a saw frame comprising a fiat plate and remforcing strip secured thereto but .separated in part therefrom so as to form a -gulde groove, achain of grooved saW blades,

and a bead formed in the reinforcing piece for engaging said groove.

4. In a chain-saw and in combination with a saw frame or guide, an endless saw com-v posed of blades linked together, .said blades avingyan extendin portion provided with a groove and said enter said groove.

5. In a chain-saw, a frame plate, in combination With an endless saw composed of blades linked together said blades having extensions on the o posite side from the cuttin Aedges providled with grooves, and

ame vhaving a bead -to inpart from it to provide a guide groove or channel for said extension, and theside of reinforcing plate having'a bead to enter the grooves in said extensions. In testimony whereof I have aflixed m signature, in resence of two Witnesses, this 14th day of ebruaryy 1906.

' SAMUEL J. BENS. Witnesses:

c M.'R. SnELY, vW. S. BOYD.

said p ate having a reinforcing strip spaced v 

